node-jose sign and verify

test.js

const {JWK, JWS} = require('node-jose')
const fs = require('fs')
const {join} = require('path')
const jwkToPem = require('jwk-to-pem')
const jwt = require('jsonwebtoken')

const certDir = '.cert'
const keystoreFile = join(certDir, 'keystore.json')


async function getKeystore() {
    const keystore = JWK.createKeyStore();
    if (!fs.existsSync(keystoreFile)) {
        if (!fs.existsSync(certDir)) {
            fs.mkdirSync(certDir)
        }
        console.log('generate keystore')
        await keystore.generate('RSA', 2048, {alg: 'RS256', use: 'sig'})
        fs.writeFileSync(keystoreFile, JSON.stringify(keystore.toJSON(true)))
    } else {
        console.log('import keystore')
        const ks = fs.readFileSync(join('.cert', 'keystore.json'))
        return await JWK.asKeyStore(ks.toString())
    }
}

async function getSigningKey() {

    // Get keystore
    const keystore = await getKeystore();

    // Use first sig key
    return keystore.all({use: 'sig'})[0]
}

async function getToken(dataToBeSigned, key) {
    return await JWS.createSign({
        compact: true,
        jwk: key,
        fields: {typ: 'jwt'}
    }, key).update(JSON.stringify(dataToBeSigned)).final();
}

async function getV(signingKey, jwtString) {
    return await JWS.createVerify(signingKey).verify(jwtString);
}


async function getDataFromJwt(jwtString, publicKey) {
    return jwt.verify(jwtString, publicKey)
}

async function getPublicKey() {
    const signingKey = await getSigningKey();
    return jwkToPem(signingKey.toJSON())
}

async function start() {


    // Sign
    //const jwtString = await getToken({foo: "bar2"}, await getSigningKey())
    const jwtString = "eyJ0eXAiOiJqd3QiLCJhbGciOiJSUzI1NiIsImtpZCI6IllhclE2anJXRG1GVVdEVGJ0NXdrSFhsaU1YYVlsbG1fbmZIdmVXeVBqTHMifQ.eyJmb28iOiJiYEIyIn0.WJ_gZGgXdVLR1tky49smb0UWvggSKH8xBIdqZ8ysWl_aTLNPnXHl8FmPkSEAATCzFwI6IOGFW6hVVlAjKLBEbfZG63xk-H3FQXlejR0jiIHeJ_VH0NpC0Gn3QJO6pIrQ0oYtpGdvLc_74_8QeL-ThDanN49HJAMN7xEvUHbz88ncI5kNIBdmUYlxeFE1Kl7b2JY49ghry7Ev28Ic6St2RbiOe2IkOCNIPpWKxSY1Zo_TLkb-48IeebSNgh4zh7-jBWNHHCAXd1z8jD-NlhqXn5umWEITUCD7X6w6p9tPGrsSiPCmol_IQkEgz-clZD5qosPC8K1AdVn2fHEoOtExGw"

    console.log('JwtString:')
    console.log(jwtString)


    // Verify signature
    const publicKey = await getPublicKey()
    let data;
    try {
        data = await getDataFromJwt(jwtString, publicKey);
    } catch (e) {
        console.log('Viga: ' + e.message)
    }
    console.log(data)
}

start()